Ya you aren't missing much. The door seals and maybe some suspension an the steering wheel is the only diff between the original sport and msport package. Just another way for them to jack up the price lol. Sense you have a 135 the bumpers and side skirts don't change with m sport like in a 3 series. Only if you had a 128 them you would get 135 front and rear bumpers which are more aggressive.

I think the suspension and steering wheel is the same bro, the only difference is the door trim and color by sunroof.. Other than that it would be the same. Cause I have an automatic .. So the gear shifter is plan anyway..